利用scala的编译组件在compile之前预先处理.scala文件，亲测可用

1.maven配置scala和Java混合开发，代码如下：

<dependencies>

<dependency>

<groupId>org.scala-lang</groupId>

<artifactId>scala-library</artifactId>

<version>2.11.2</version>

</dependency>

</dependencies>

<build>

<sourceDirectory>src/main/java</sourceDirectory>

<testSourceDirectory>src/test/java</testSourceDirectory>

<plugins>

<plugin>

<groupId>org.scala-tools</groupId>

<artifactId>maven-scala-plugin</artifactId>

<version>2.14.1</version>

<executions>

<execution>

<id>scala-compile-first</id>

<goals>

<goal>compile</goal>

</goals>

<configuration>

<includes>

<include>**/*.scala</include>

</includes>

</configuration>

</execution>

<execution>

<id>scala-test-compile</id>

<goals>

<goal>testCompile</goal>

</goals>

</execution>

</executions>

</plugin>

</plugins>

</build>